Dynamic crypto key management for mobility in a cloud environment

ABSTRACT

Aspects of the disclosure relate to dynamic crypto key management for mobility in a cloud environment. A computing platform may receive a request to generate a new tenant master key and a new server recovery key. Subsequently, the computing platform may send to a cloud-based key vault server, the new tenant master key and the new server recovery key. The computing platform may send to a tenant database, the encrypted server recovery key. As a result, the computing platform may provision the enrollment servers with the encrypted server recovery key. In some embodiments, the enrollment servers are configured to manage enrollment of policy-managed devices in a policy enforcement scheme and to authenticate with the key update service based on the encrypted server recovery key.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of co-pending U.S. application Ser. No. 15/800,625, entitled “Dynamic Crypto Key Management for Mobility in a Cloud Environment,” filed Nov. 1, 2017, the contents of which are incorporated by reference in its entirety in this disclosure.

TECHNICAL FIELD

Aspects described herein generally relate to ensuring information security and managing encryption keys. In particular, one or more aspects of the disclosure relate to providing dynamic encryption key management in cloud computing environments.

BACKGROUND

Enterprise organizations are increasingly relying on encryption keys (which may, e.g., also be referred to as “crypto keys”) stored in a key vault to protect the safety and security of the enterprise information and resources. In the event that the crypto keys are compromised or the crypto keys need to be upgraded in a normal operation, the key update process may cause service interruption to users for a prolonged period of time. The problems grow as more companies are moving to cloud computing environments, where key upgrades may occur frequently. Managing and updating encryption keys, particularly in cloud computing environments, thus presents various technical challenges.

SUMMARY

The following presents a simplified summary of various aspects described herein. This summary is not an extensive overview, and is not intended to identify key or critical elements or to delineate the scope of the claims. The following summary merely presents some concepts in a simplified form as an introductory prelude to the more detailed description provided below.

To overcome limitations in the prior art described above, and to overcome other limitations that will be apparent upon reading and understanding the present specification, aspects described herein are directed towards providing dynamic encryption key management in cloud computing environments.

In accordance with one or more aspects of the disclosure, a computing platform having at least one processor, memory, and a communication interface may receive, via a key upgrade service provided by the computing platform, from an administrator console device, a request to generate one or more new keys. In response to receiving the request to generate the one or more new keys, the computing platform may generate a new tenant master key and a new server recovery key. Subsequently, the computing platform may send, via the communication interface, to a cloud-based key vault server, the new tenant master key and the new server recovery key, where the cloud-based key vault server is configured to store the new tenant master key and is further configured to encrypt the new server recovery key with the new tenant master key to produce an encrypted server recovery key. Thereafter, the computing platform may receive, via the communication interface, from the cloud-based key vault server, the encrypted server recovery key. Further, the computing platform may send, via the communication interface, to a tenant database server associated with one or more enrollment servers, the encrypted server recovery key. Subsequently, the computing platform may provision the one or more enrollment servers with the encrypted server recovery key by sending the encrypted server recovery key to the one or more enrollment servers via the communication interface. In addition, the one or more enrollment servers may be configured to manage enrollment of one or more policy-managed devices in a policy enforcement scheme and to authenticate with the key update service based on the encrypted server recovery key.

In some instances, the computing platform may detect a new enrollment server is online, and send, via the communication interface, the encrypted server recovery key to the new enrollment server. In some embodiments, the computing platform may provision the new enrollment server enabling the one or more policy-managed devices to enroll with the new enrollment server. Further, the computing platform may send, via the communication interface, commands to the one or more policy-managed devices to generate a device key for each of the one or more policy-managed devices. In some instances, sending such commands may cause the one or more policy-managed devices to: receive a passphrase from a user of the one or more policy-managed devices; generate an encrypted device key based on the passphrase; and store the encrypted device key in local storage of the one or more policy-managed devices. In some instances, the computing platform may send, via the communication interface, commands to the one or more policy-managed devices to generate file keys for one or more files residing on the one or more policy-managed devices.

In some instances, the computing platform may send, via the communication interface, commands directing a device management server to send new variables to the one or more policy-managed devices. For example, such commands may cause the policy-managed devices to: receive the new variables from the device management server; and generate a device key based on the new variables from the device management server. As a result, the policy-managed devices may receive the new variables from the device management server; and generate a device key based on the new variables from the device management server. In some embodiments, such commands may cause the one or more policy-managed devices to: read offline variables from local storage of the one or more policy-managed devices; generate an offline device key based on the offline variables from the local storage; read offline encrypted file keys from the local storage, where the offline encrypted file keys correspond to files residing on the one or more policy-managed devices; decrypt the offline encrypted file keys with the offline device key to generate decrypted file keys; and encrypt the decrypted file keys with the device key generated based on the new variables to generate encrypted file keys. In some instances, such commands may cause the one or more policy-managed devices to: store the encrypted file keys and the new variables in the local storage of the one or more policy-managed devices.

These and additional aspects will be appreciated with the benefit of the disclosures discussed in further detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of aspects described herein and the advantages thereof may be acquired by referring to the following description in consideration of the accompanying drawings, in which like reference numbers indicate like features, and wherein:

FIG. 1 depicts an illustrative computer system architecture that may be used in accordance with one or more illustrative aspects described herein.

FIG. 2 depicts an illustrative remote-access system architecture that may be used in accordance with one or more illustrative aspects described herein.

FIG. 3 depicts an illustrative virtualized (hypervisor) system architecture that may be used in accordance with one or more illustrative aspects described herein.

FIG. 4 depicts an illustrative cloud-based system architecture that may be used in accordance with one or more illustrative aspects described herein.

FIG. 5 depicts an illustrative enterprise mobility management system.

FIG. 6 depicts another illustrative enterprise mobility management system.

FIG. 7 depicts an illustrative computing environment for dynamic crypto key management for mobility in a cloud environment in accordance with one or more illustrative aspects described herein.

FIGS. 8A-8E depict an example event sequence for dynamic crypto key management for mobility in a cloud environment in accordance with one or more illustrative aspects described herein.

FIG. 9 depicts an example method of dynamic crypto key management for mobility in a cloud environment in accordance with one or more illustrative aspects described herein.

DETAILED DESCRIPTION

In the following description of the various embodiments, reference is made to the accompanying drawings identified above and which form a part hereof, and in which is shown by way of illustration various embodiments in which aspects described herein may be practiced. It is to be understood that other embodiments may be utilized and structural and functional modifications may be made without departing from the scope described herein. Various aspects are capable of other embodiments and of being practiced or being carried out in various different ways.

As a general introduction to the subject matter described in more detail below, aspects described herein relate to providing dynamic encryption key management for mobility environments. Companies frequently use crypto keys to protect their confidential information. But there may be a lengthy recovery period to regenerate the keys in case of a breach. In addition, there may be a requirement for companies in the cloud to be agile in face of the changing policies, standards and compliance requirements. More importantly, the standard way to keep the companies' secret crypto keys in a Hardware Security Module (HSM) in the cloud may be charged per access, which may impose excessive cost for the companies. Aspects of the disclosure implement a layered approach for crypto key management with several levels of abstractions. Instead of storing all the keys in the HSM, a master tenant key retrieved from the cloud-based key vault server may be used to secure other keys that are accessed more frequently without incurring excessive cost. The technical solutions provided by aspects of the disclosure address these technical challenges and offer increased agility, performance and efficiency.

It is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. Rather, the phrases and terms used herein are to be given their broadest interpretation and meaning. The use of “including” and “comprising” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items and equivalents thereof. The use of the terms “mounted,” “connected,” “coupled,” “positioned,” “engaged” and similar terms, is meant to include both direct and indirect mounting, connecting, coupling, positioning and engaging.

Computing Architecture

Computer software, hardware, and networks may be utilized in a variety of different system environments, including standalone, networked, remote-access (aka, remote desktop), virtualized, and/or cloud-based environments, among others. FIG. 1 illustrates one example of a system architecture and data processing device that may be used to implement one or more illustrative aspects described herein in a standalone and/or networked environment. Various network nodes 103, 105, 107, and 109 may be interconnected via a wide area network (WAN) 101, such as the Internet. Other networks may also or alternatively be used, including private intranets, corporate networks, local area networks (LAN), metropolitan area networks (MAN), wireless networks, personal networks (PAN), and the like. Network 101 is for illustration purposes and may be replaced with fewer or additional computer networks. A local area network 133 may have one or more of any known LAN topology and may use one or more of a variety of different protocols, such as Ethernet. Devices 103, 105, 107, and 109 and other devices (not shown) may be connected to one or more of the networks via twisted pair wires, coaxial cable, fiber optics, radio waves, or other communication media.

The term “network” as used herein and depicted in the drawings refers not only to systems in which remote storage devices are coupled together via one or more communication paths, but also to stand-alone devices that may be coupled, from time to time, to such systems that have storage capability. Consequently, the term “network” includes not only a “physical network” but also a “content network,” which is comprised of the data—attributable to a single entity—which resides across all physical networks.

The components may include data server 103, web server 105, and client computers 107, 109. Data server 103 provides overall access, control and administration of databases and control software for performing one or more illustrative aspects describe herein. Data server 103 may be connected to web server 105 through which users interact with and obtain data as requested. Alternatively, data server 103 may act as a web server itself and be directly connected to the Internet. Data server 103 may be connected to web server 105 through the local area network 133, the wide area network 101 (e.g., the Internet), via direct or indirect connection, or via some other network. Users may interact with the data server 103 using remote computers 107, 109, e.g., using a web browser to connect to the data server 103 via one or more externally exposed web sites hosted by web server 105. Client computers 107, 109 may be used in concert with data server 103 to access data stored therein, or may be used for other purposes. For example, from client device 107 a user may access web server 105 using an Internet browser, as is known in the art, or by executing a software application that communicates with web server 105 and/or data server 103 over a computer network (such as the Internet).

Servers and applications may be combined on the same physical machines, and retain separate virtual or logical addresses, or may reside on separate physical machines. FIG. 1 illustrates just one example of a network architecture that may be used, and those of skill in the art will appreciate that the specific network architecture and data processing devices used may vary, and are secondary to the functionality that they provide, as further described herein. For example, services provided by web server 105 and data server 103 may be combined on a single server.

Each component 103, 105, 107, 109 may be any type of known computer, server, or data processing device. Data server 103, e.g., may include a processor 111 controlling overall operation of the data server 103. Data server 103 may further include random access memory (RAM) 113, read only memory (ROM) 115, network interface 117, input/output interfaces 119 (e.g., keyboard, mouse, display, printer, etc.), and memory 121. Input/output (I/O) 119 may include a variety of interface units and drives for reading, writing, displaying, and/or printing data or files. Memory 121 may further store operating system software 123 for controlling overall operation of the data processing device 103, control logic 125 for instructing data server 103 to perform aspects described herein, and other application software 127 providing secondary, support, and/or other functionality which may or might not be used in conjunction with aspects described herein. The control logic may also be referred to herein as the data server software 125. Functionality of the data server software may refer to operations or decisions made automatically based on rules coded into the control logic, made manually by a user providing input into the system, and/or a combination of automatic processing based on user input (e.g., queries, data updates, etc.).

Memory 121 may also store data used in performance of one or more aspects described herein, including a first database 129 and a second database 131. In some embodiments, the first database may include the second database (e.g., as a separate table, report, etc.). That is, the information can be stored in a single database, or separated into different logical, virtual, or physical databases, depending on system design. Devices 105, 107, and 109 may have similar or different architecture as described with respect to device 103. Those of skill in the art will appreciate that the functionality of data processing device 103 (or device 105, 107, or 109) as described herein may be spread across multiple data processing devices, for example, to distribute processing load across multiple computers, to segregate transactions based on geographic location, user access level, quality of service (QoS), etc.

One or more aspects may be embodied in computer-usable or readable data and/or computer-executable instructions, such as in one or more program modules, executed by one or more computers or other devices as described herein. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types when executed by a processor in a computer or other device. The modules may be written in a source code programming language that is subsequently compiled for execution, or may be written in a scripting language such as (but not limited to) HyperText Markup Language (HTML) or Extensible Markup Language (XML). The computer executable instructions may be stored on a computer readable medium such as a nonvolatile storage device. Any suitable computer readable storage media may be utilized, including hard disks, CD-ROMs, optical storage devices, magnetic storage devices, and/or any combination thereof. In addition, various transmission (non-storage) media representing data or events as described herein may be transferred between a source and a destination in the form of electromagnetic waves traveling through signal-conducting media such as metal wires, optical fibers, and/or wireless transmission media (e.g., air and/or space). Various aspects described herein may be embodied as a method, a data processing system, or a computer program product. Therefore, various functionalities may be embodied in whole or in part in software, firmware, and/or hardware or hardware equivalents such as integrated circuits, field programmable gate arrays (FPGA), and the like. Particular data structures may be used to more effectively implement one or more aspects described herein, and such data structures are contemplated within the scope of computer executable instructions and computer-usable data described herein.

With further reference to FIG. 2, one or more aspects described herein may be implemented in a remote-access environment. FIG. 2 depicts an example system architecture including a computing device 201 in an illustrative computing environment 200 that may be used according to one or more illustrative aspects described herein. Computing device 201 may be used as a server 206 a in a single-server or multi-server desktop virtualization system (e.g., a remote access or cloud system) configured to provide virtual machines for client access devices. The computing device 201 may have a processor 203 for controlling overall operation of the server and its associated components, including RAM 205, ROM 207, Input/Output (I/O) module 209, and memory 215.

I/O module 209 may include a mouse, keypad, touch screen, scanner, optical reader, and/or stylus (or other input device(s)) through which a user of computing device 201 may provide input, and may also include one or more of a speaker for providing audio output and one or more of a video display device for providing textual, audiovisual, and/or graphical output. Software may be stored within memory 215 and/or other storage to provide instructions to processor 203 for configuring computing device 201 into a special purpose computing device in order to perform various functions as described herein. For example, memory 215 may store software used by the computing device 201, such as an operating system 217, application programs 219, and an associated database 221.

Computing device 201 may operate in a networked environment supporting connections to one or more remote computers, such as terminals 240 (also referred to as client devices). The terminals 240 may be personal computers, mobile devices, laptop computers, tablets, or servers that include many or all of the elements described above with respect to the computing device 103 or 201. The network connections depicted in FIG. 2 include a local area network (LAN) 225 and a wide area network (WAN) 229, but may also include other networks. When used in a LAN networking environment, computing device 201 may be connected to the LAN 225 through a network interface or adapter 223. When used in a WAN networking environment, computing device 201 may include a modem 227 or other wide area network interface for establishing communications over the WAN 229, such as computer network 230 (e.g., the Internet). It will be appreciated that the network connections shown are illustrative and other means of establishing a communications link between the computers may be used. Computing device 201 and/or terminals 240 may also be mobile terminals (e.g., mobile phones, smartphones, personal digital assistants (PDAs), notebooks, etc.) including various other components, such as a battery, speaker, and antennas (not shown).

Aspects described herein may also be operational with numerous other general purpose or special purpose computing system environments or configurations. Examples of other computing systems, environments, and/or configurations that may be suitable for use with aspects described herein include, but are not limited to, personal computers, server computers, hand-held or laptop devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network personal computers (PCs), minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.

As shown in FIG. 2, one or more client devices 240 may be in communication with one or more servers 206 a-206 n (generally referred to herein as “server(s) 206”). In one embodiment, the computing environment 200 may include a network appliance installed between the server(s) 206 and client machine(s) 240. The network appliance may manage client/server connections, and in some cases can load balance client connections amongst a plurality of backend servers 206.

The client machine(s) 240 may in some embodiments be referred to as a single client machine 240 or a single group of client machines 240, while server(s) 206 may be referred to as a single server 206 or a single group of servers 206. In one embodiment a single client machine 240 communicates with more than one server 206, while in another embodiment a single server 206 communicates with more than one client machine 240. In yet another embodiment, a single client machine 240 communicates with a single server 206.

A client machine 240 can, in some embodiments, be referenced by any one of the following non-exhaustive terms: client machine(s); client(s); client computer(s); client device(s); client computing device(s); local machine; remote machine; client node(s); endpoint(s); or endpoint node(s). The server 206, in some embodiments, may be referenced by any one of the following non-exhaustive terms: server(s), local machine; remote machine; server farm(s), or host computing device(s).

In one embodiment, the client machine 240 may be a virtual machine. The virtual machine may be any virtual machine, while in some embodiments the virtual machine may be any virtual machine managed by a Type 1 or Type 2 hypervisor, for example, a hypervisor developed by Citrix Systems, IBM, VMware, or any other hypervisor. In some aspects, the virtual machine may be managed by a hypervisor, while in other aspects the virtual machine may be managed by a hypervisor executing on a server 206 or a hypervisor executing on a client 240.

Some embodiments include a client device 240 that displays application output generated by an application remotely executing on a server 206 or other remotely located machine. In these embodiments, the client device 240 may execute a virtual machine receiver program or application to display the output in an application window, a browser, or other output window. In one example, the application is a desktop, while in other examples the application is an application that generates or presents a desktop. A desktop may include a graphical shell providing a user interface for an instance of an operating system in which local and/or remote applications can be integrated. Applications, as used herein, are programs that execute after an instance of an operating system (and, optionally, also the desktop) has been loaded.

The server 206, in some embodiments, uses a remote presentation protocol or other program to send data to a thin-client or remote-display application executing on the client to present display output generated by an application executing on the server 206. The thin-client or remote-display protocol can be any one of the following non-exhaustive list of protocols: the Independent Computing Architecture (ICA) protocol developed by Citrix Systems, Inc. of Ft. Lauderdale, Fla.; or the Remote Desktop Protocol (RDP) manufactured by the Microsoft Corporation of Redmond, Wash.

A remote computing environment may include more than one server 206 a-206 n such that the servers 206 a-206 n are logically grouped together into a server farm 206, for example, in a cloud computing environment. The server farm 206 may include servers 206 that are geographically dispersed while and logically grouped together, or servers 206 that are located proximate to each other while logically grouped together. Geographically dispersed servers 206 a-206 n within a server farm 206 can, in some embodiments, communicate using a WAN (wide), MAN (metropolitan), or LAN (local), where different geographic regions can be characterized as: different continents; different regions of a continent; different countries; different states; different cities; different campuses; different rooms; or any combination of the preceding geographical locations. In some embodiments the server farm 206 may be administered as a single entity, while in other embodiments the server farm 206 can include multiple server farms.

In some embodiments, a server farm may include servers 206 that execute a substantially similar type of operating system platform (e.g., WINDOWS, UNIX, LINUX, iOS, ANDROID, SYMBIAN, etc.) In other embodiments, server farm 206 may include a first group of one or more servers that execute a first type of operating system platform, and a second group of one or more servers that execute a second type of operating system platform.

Server 206 may be configured as any type of server, as needed, e.g., a file server, an application server, a web server, a proxy server, an appliance, a network appliance, a gateway, an application gateway, a gateway server, a virtualization server, a deployment server, a Secure Sockets Layer (SSL) VPN server, a firewall, a web server, an application server or as a master application server, a server executing an active directory, or a server executing an application acceleration program that provides firewall functionality, application functionality, or load balancing functionality. Other server types may also be used.

Some embodiments include a first server 206 a that receives requests from a client machine 240, forwards the request to a second server 206 b (not shown), and responds to the request generated by the client machine 240 with a response from the second server 206 b (not shown.) First server 206 a may acquire an enumeration of applications available to the client machine 240 and well as address information associated with an application server 206 hosting an application identified within the enumeration of applications. First server 206 a can then present a response to the client's request using a web interface, and communicate directly with the client 240 to provide the client 240 with access to an identified application. One or more clients 240 and/or one or more servers 206 may transmit data over network 230, e.g., network 101.

FIG. 3 shows a high-level architecture of an illustrative desktop virtualization system. As shown, the desktop virtualization system may be single-server or multi-server system, or cloud system, including at least one virtualization server 301 configured to provide virtual desktops and/or virtual applications to one or more client access devices 240. As used herein, a desktop refers to a graphical environment or space in which one or more applications may be hosted and/or executed. A desktop may include a graphical shell providing a user interface for an instance of an operating system in which local and/or remote applications can be integrated. Applications may include programs that execute after an instance of an operating system (and, optionally, also the desktop) has been loaded. Each instance of the operating system may be physical (e.g., one operating system per device) or virtual (e.g., many instances of an OS running on a single device). Each application may be executed on a local device, or executed on a remotely located device (e.g., remoted).

A computer device 301 may be configured as a virtualization server in a virtualization environment, for example, a single-server, multi-server, or cloud computing environment. Virtualization server 301 illustrated in FIG. 3 can be deployed as and/or implemented by one or more embodiments of the server 206 illustrated in FIG. 2 or by other known computing devices. Included in virtualization server 301 is a hardware layer that can include one or more physical disks 304, one or more physical devices 306, one or more physical processors 308, and one or more physical memories 316. In some embodiments, firmware 312 can be stored within a memory element in the physical memory 316 and can be executed by one or more of the physical processors 308. Virtualization server 301 may further include an operating system 314 that may be stored in a memory element in the physical memory 316 and executed by one or more of the physical processors 308. Still further, a hypervisor 302 may be stored in a memory element in the physical memory 316 and can be executed by one or more of the physical processors 308.

Executing on one or more of the physical processors 308 may be one or more virtual machines 332A-C (generally 332). Each virtual machine 332 may have a virtual disk 326A-C and a virtual processor 328A-C. In some embodiments, a first virtual machine 332A may execute, using a virtual processor 328A, a control program 320 that includes a tools stack 324. Control program 320 may be referred to as a control virtual machine, Dom0, Domain 0, or other virtual machine used for system administration and/or control. In some embodiments, one or more virtual machines 332B-C can execute, using a virtual processor 328B-C, a guest operating system 330A-B.

Virtualization server 301 may include a hardware layer 310 with one or more pieces of hardware that communicate with the virtualization server 301. In some embodiments, the hardware layer 310 can include one or more physical disks 304, one or more physical devices 306, one or more physical processors 308, and one or more physical memory 316. Physical components 304, 306, 308, and 316 may include, for example, any of the components described above. Physical devices 306 may include, for example, a network interface card, a video card, a keyboard, a mouse, an input device, a monitor, a display device, speakers, an optical drive, a storage device, a universal serial bus connection, a printer, a scanner, a network element (e.g., router, firewall, network address translator, load balancer, virtual private network (VPN) gateway, Dynamic Host Configuration Protocol (DHCP) router, etc.), or any device connected to or communicating with virtualization server 301. Physical memory 316 in the hardware layer 310 may include any type of memory. Physical memory 316 may store data, and in some embodiments may store one or more programs, or set of executable instructions. FIG. 3 illustrates an embodiment where firmware 312 is stored within the physical memory 316 of virtualization server 301. Programs or executable instructions stored in the physical memory 316 can be executed by the one or more processors 308 of virtualization server 301.

Virtualization server 301 may also include a hypervisor 302. In some embodiments, hypervisor 302 may be a program executed by processors 308 on virtualization server 301 to create and manage any number of virtual machines 332. Hypervisor 302 may be referred to as a virtual machine monitor, or platform virtualization software. In some embodiments, hypervisor 302 can be any combination of executable instructions and hardware that monitors virtual machines executing on a computing machine. Hypervisor 302 may be Type 2 hypervisor, where the hypervisor executes within an operating system 314 executing on the virtualization server 301. Virtual machines may then execute at a level above the hypervisor. In some embodiments, the Type 2 hypervisor may execute within the context of a user's operating system such that the Type 2 hypervisor interacts with the user's operating system. In other embodiments, one or more virtualization servers 301 in a virtualization environment may instead include a Type 1 hypervisor (not shown). A Type 1 hypervisor may execute on the virtualization server 301 by directly accessing the hardware and resources within the hardware layer 310. That is, while a Type 2 hypervisor 302 accesses system resources through a host operating system 314, as shown, a Type 1 hypervisor may directly access all system resources without the host operating system 314. A Type 1 hypervisor may execute directly on one or more physical processors 308 of virtualization server 301, and may include program data stored in the physical memory 316.

Hypervisor 302, in some embodiments, can provide virtual resources to operating systems 330 or control programs 320 executing on virtual machines 332 in any manner that simulates the operating systems 330 or control programs 320 having direct access to system resources. System resources can include, but are not limited to, physical devices 306, physical disks 304, physical processors 308, physical memory 316, and any other component included in virtualization server 301 hardware layer 310. Hypervisor 302 may be used to emulate virtual hardware, partition physical hardware, virtualize physical hardware, and/or execute virtual machines that provide access to computing environments. In still other embodiments, hypervisor 302 may control processor scheduling and memory partitioning for a virtual machine 332 executing on virtualization server 301. Hypervisor 302 may include those manufactured by VMWare, Inc., of Palo Alto, Calif.; the XENPROJECT hypervisor, an open source product whose development is overseen by the open source XenProject.org community; HyperV, VirtualServer or virtual PC hypervisors provided by Microsoft, or others. In some embodiments, virtualization server 301 may execute a hypervisor 302 that creates a virtual machine platform on which guest operating systems may execute. In these embodiments, the virtualization server 301 may be referred to as a host server. An example of such a virtualization server is the XENSERVER provided by Citrix Systems, Inc., of Fort Lauderdale, Fla.

Hypervisor 302 may create one or more virtual machines 332B-C (generally 332) in which guest operating systems 330 execute. In some embodiments, hypervisor 302 may load a virtual machine image to create a virtual machine 332. In other embodiments, the hypervisor 302 may execute a guest operating system 330 within virtual machine 332. In still other embodiments, virtual machine 332 may execute guest operating system 330.

In addition to creating virtual machines 332, hypervisor 302 may control the execution of at least one virtual machine 332. In other embodiments, hypervisor 302 may present at least one virtual machine 332 with an abstraction of at least one hardware resource provided by the virtualization server 301 (e.g., any hardware resource available within the hardware layer 310). In other embodiments, hypervisor 302 may control the manner in which virtual machines 332 access physical processors 308 available in virtualization server 301. Controlling access to physical processors 308 may include determining whether a virtual machine 332 should have access to a processor 308, and how physical processor capabilities are presented to the virtual machine 332.

As shown in FIG. 3, virtualization server 301 may host or execute one or more virtual machines 332. A virtual machine 332 is a set of executable instructions that, when executed by a processor 308, may imitate the operation of a physical computer such that the virtual machine 332 can execute programs and processes much like a physical computing device. While FIG. 3 illustrates an embodiment where a virtualization server 301 hosts three virtual machines 332, in other embodiments virtualization server 301 can host any number of virtual machines 332. Hypervisor 302, in some embodiments, may provide each virtual machine 332 with a unique virtual view of the physical hardware, memory, processor, and other system resources available to that virtual machine 332. In some embodiments, the unique virtual view can be based on one or more of virtual machine permissions, application of a policy engine to one or more virtual machine identifiers, a user accessing a virtual machine, the applications executing on a virtual machine, networks accessed by a virtual machine, or any other desired criteria. For instance, hypervisor 302 may create one or more unsecure virtual machines 332 and one or more secure virtual machines 332. Unsecure virtual machines 332 may be prevented from accessing resources, hardware, memory locations, and programs that secure virtual machines 332 may be permitted to access. In other embodiments, hypervisor 302 may provide each virtual machine 332 with a substantially similar virtual view of the physical hardware, memory, processor, and other system resources available to the virtual machines 332.

Each virtual machine 332 may include a virtual disk 326A-C (generally 326) and a virtual processor 328A-C (generally 328.) The virtual disk 326, in some embodiments, is a virtualized view of one or more physical disks 304 of the virtualization server 301, or a portion of one or more physical disks 304 of the virtualization server 301. The virtualized view of the physical disks 304 can be generated, provided, and managed by the hypervisor 302. In some embodiments, hypervisor 302 provides each virtual machine 332 with a unique view of the physical disks 304. Thus, in these embodiments, the particular virtual disk 326 included in each virtual machine 332 can be unique when compared with the other virtual disks 326.

A virtual processor 328 can be a virtualized view of one or more physical processors 308 of the virtualization server 301. In some embodiments, the virtualized view of the physical processors 308 can be generated, provided, and managed by hypervisor 302. In some embodiments, virtual processor 328 has substantially all of the same characteristics of at least one physical processor 308. In other embodiments, virtual processor 308 provides a modified view of physical processors 308 such that at least some of the characteristics of the virtual processor 328 are different than the characteristics of the corresponding physical processor 308.

With further reference to FIG. 4, some aspects described herein may be implemented in a cloud-based environment. FIG. 4 illustrates an example of a cloud computing environment (or cloud system) 400. As seen in FIG. 4, client computers 411-414 may communicate with a cloud management server 410 to access the computing resources (e.g., host servers 403 a-403 b (generally referred herein as “host servers 403”), storage resources 404 a-404 b (generally referred herein as “storage resources 404”), and network resources 405 a-405 b (generally referred herein as “network resources 405”)) of the cloud system.

Management server 410 may be implemented on one or more physical servers. The management server 410 may run, for example, CLOUDPLATFORM by Citrix Systems, Inc. of Ft. Lauderdale, Fla., or OPENSTACK, among others. Management server 410 may manage various computing resources, including cloud hardware and software resources, for example, host computers 403, data storage devices 404, and networking devices 405. The cloud hardware and software resources may include private and/or public components. For example, a cloud may be configured as a private cloud to be used by one or more particular customers or client computers 411-414 and/or over a private network. In other embodiments, public clouds or hybrid public-private clouds may be used by other customers over an open or hybrid networks.

Management server 410 may be configured to provide user interfaces through which cloud operators and cloud customers may interact with the cloud system 400. For example, the management server 410 may provide a set of application programming interfaces (APIs) and/or one or more cloud operator console applications (e.g., web-based or standalone applications) with user interfaces to allow cloud operators to manage the cloud resources, configure the virtualization layer, manage customer accounts, and perform other cloud administration tasks. The management server 410 also may include a set of APIs and/or one or more customer console applications with user interfaces configured to receive cloud computing requests from end users via client computers 411-414, for example, requests to create, modify, or destroy virtual machines within the cloud. Client computers 411-414 may connect to management server 410 via the Internet or some other communication network, and may request access to one or more of the computing resources managed by management server 410. In response to client requests, the management server 410 may include a resource manager configured to select and provision physical resources in the hardware layer of the cloud system based on the client requests. For example, the management server 410 and additional components of the cloud system may be configured to provision, create, and manage virtual machines and their operating environments (e.g., hypervisors, storage resources, services offered by the network elements, etc.) for customers at client computers 411-414, over a network (e.g., the Internet), providing customers with computational resources, data storage services, networking capabilities, and computer platform and application support. Cloud systems also may be configured to provide various specific services, including security systems, development environments, user interfaces, and the like.

Certain clients 411-414 may be related, for example, different client computers creating virtual machines on behalf of the same end user, or different users affiliated with the same company or organization. In other examples, certain clients 411-414 may be unrelated, such as users affiliated with different companies or organizations. For unrelated clients, information on the virtual machines or storage of any one user may be hidden from other users.

Referring now to the physical hardware layer of a cloud computing environment, availability zones 401-402 (or zones) may refer to a collocated set of physical computing resources. Zones may be geographically separated from other zones in the overall cloud of computing resources. For example, zone 401 may be a first cloud datacenter located in California, and zone 402 may be a second cloud datacenter located in Florida. Management server 410 may be located at one of the availability zones, or at a separate location. Each zone may include an internal network that interfaces with devices that are outside of the zone, such as the management server 410, through a gateway. End users of the cloud (e.g., clients 411-414) might or might not be aware of the distinctions between zones. For example, an end user may request the creation of a virtual machine having a specified amount of memory, processing power, and network capabilities. The management server 410 may respond to the user's request and may allocate the resources to create the virtual machine without the user knowing whether the virtual machine was created using resources from zone 401 or zone 402. In other examples, the cloud system may allow end users to request that virtual machines (or other cloud resources) are allocated in a specific zone or on specific resources 403-405 within a zone.

In this example, each zone 401-402 may include an arrangement of various physical hardware components (or computing resources) 403-405, for example, physical hosting resources (or processing resources), physical network resources, physical storage resources, switches, and additional hardware resources that may be used to provide cloud computing services to customers. The physical hosting resources in a cloud zone 401-402 may include one or more computer servers 403, such as the virtualization servers 301 described above, which may be configured to create and host virtual machine instances. The physical network resources in a cloud zone 401 or 402 may include one or more network elements 405 (e.g., network service providers) comprising hardware and/or software configured to provide a network service to cloud customers, such as firewalls, network address translators, load balancers, virtual private network (VPN) gateways, Dynamic Host Configuration Protocol (DHCP) routers, and the like. The storage resources in the cloud zone 401-402 may include storage disks (e.g., solid state drives (SSDs), magnetic hard disks, etc.) and other storage devices.

The example cloud computing environment shown in FIG. 4 also may include a virtualization layer (e.g., as shown in FIGS. 1-3) with additional hardware and/or software resources configured to create and manage virtual machines and provide other services to customers using the physical resources in the cloud. The virtualization layer may include hypervisors, as described above in FIG. 3, along with other components to provide network virtualizations, storage virtualizations, etc. The virtualization layer may be as a separate layer from the physical resource layer, or may share some or all of the same hardware and/or software resources with the physical resource layer. For example, the virtualization layer may include a hypervisor installed in each of the virtualization servers 403 with the physical computing resources. Known cloud systems may alternatively be used, e.g., WINDOWS AZURE (Microsoft Corporation of Redmond Wash.), AMAZON EC2 (Amazon.com Inc. of Seattle, Wash.), IBM BLUE CLOUD (IBM Corporation of Armonk, N.Y.), or others.

Enterprise Mobility Management Architecture

FIG. 5 represents an enterprise mobility technical architecture 500 for use in a “Bring Your Own Device” (BYOD) environment. The architecture enables a user of a mobile device 502 to both access enterprise or personal resources from a mobile device 502 and use the mobile device 502 for personal use. The user may access such enterprise resources 504 or enterprise services 508 using a mobile device 502 that is purchased by the user or a mobile device 502 that is provided by the enterprise to the user. The user may utilize the mobile device 502 for business use only or for business and personal use. The mobile device 502 may run an iOS operating system, an Android operating system, or the like. The enterprise may choose to implement policies to manage the mobile device 502. The policies may be implemented through a firewall or gateway in such a way that the mobile device 502 may be identified, secured or security verified, and provided selective or full access to the enterprise resources (e.g., 504 and 508.) The policies may be mobile device management policies, mobile application management policies, mobile data management policies, or some combination of mobile device, application, and data management policies. A mobile device 502 that is managed through the application of mobile device management policies may be referred to as an enrolled device.

In some embodiments, the operating system of the mobile device 502 may be separated into a managed partition 510 and an unmanaged partition 512. The managed partition 510 may have policies applied to it to secure the applications running on and data stored in the managed partition 510. The applications running on the managed partition 510 may be secure applications. In other embodiments, all applications may execute in accordance with a set of one or more policy files received separate from the application, and which define one or more security parameters, features, resource restrictions, and/or other access controls that are enforced by the mobile device management system when that application is executing on the mobile device 502. By operating in accordance with their respective policy file(s), each application may be allowed or restricted from communications with one or more other applications and/or resources, thereby creating a virtual partition. Thus, as used herein, a partition may refer to a physically partitioned portion of memory (physical partition), a logically partitioned portion of memory (logical partition), and/or a virtual partition created as a result of enforcement of one or more policies and/or policy files across multiple applications as described herein (virtual partition). Stated differently, by enforcing policies on managed applications, those applications may be restricted to only be able to communicate with other managed applications and trusted enterprise resources, thereby creating a virtual partition that is impenetrable by unmanaged applications and devices.

The secure applications may be email applications, web browsing applications, software-as-a-service (SaaS) access applications, Windows Application access applications, and the like. The secure applications may be secure native applications 514, secure remote applications 522 executed by a secure application launcher 518, virtualization applications 526 executed by a secure application launcher 518, and the like. The secure native applications 514 may be wrapped by a secure application wrapper 520. The secure application wrapper 520 may include integrated policies that are executed on the mobile device 502 when the secure native application 514 is executed on the mobile device 502. The secure application wrapper 520 may include meta-data that points the secure native application 514 running on the mobile device 502 to the resources hosted at the enterprise (e.g., 504 and 508) that the secure native application 514 may require to complete the task requested upon execution of the secure native application 514. The secure remote applications 522 executed by a secure application launcher 518 may be executed within the secure application launcher 518. The virtualization applications 526 executed by a secure application launcher 518 may utilize resources on the mobile device 502, at the enterprise resources 504, and the like. The resources used on the mobile device 502 by the virtualization applications 526 executed by a secure application launcher 518 may include user interaction resources, processing resources, and the like. The user interaction resources may be used to collect and transmit keyboard input, mouse input, camera input, tactile input, audio input, visual input, gesture input, and the like. The processing resources may be used to present a user interface, process data received from the enterprise resources 504, and the like. The resources used at the enterprise resources 504 by the virtualization applications 526 executed by a secure application launcher 518 may include user interface generation resources, processing resources, and the like. The user interface generation resources may be used to assemble a user interface, modify a user interface, refresh a user interface, and the like. The processing resources may be used to create information, read information, update information, delete information, and the like. For example, the virtualization application 526 may record user interactions associated with a graphical user interface (GUI) and communicate them to a server application where the server application will use the user interaction data as an input to the application operating on the server. In such an arrangement, an enterprise may elect to maintain the application on the server side as well as data, files, etc. associated with the application. While an enterprise may elect to “mobilize” some applications in accordance with the principles herein by securing them for deployment on the mobile device 502, this arrangement may also be elected for certain applications. For example, while some applications may be secured for use on the mobile device 502, others might not be prepared or appropriate for deployment on the mobile device 502 so the enterprise may elect to provide the mobile user access to the unprepared applications through virtualization techniques. As another example, the enterprise may have large complex applications with large and complex data sets (e.g., material resource planning applications) where it would be very difficult, or otherwise undesirable, to customize the application for the mobile device 502 so the enterprise may elect to provide access to the application through virtualization techniques. As yet another example, the enterprise may have an application that maintains highly secured data (e.g., human resources data, customer data, engineering data) that may be deemed by the enterprise as too sensitive for even the secured mobile environment so the enterprise may elect to use virtualization techniques to permit mobile access to such applications and data. An enterprise may elect to provide both fully secured and fully functional applications on the mobile device 502 as well as a virtualization application 526 to allow access to applications that are deemed more properly operated on the server side. In an embodiment, the virtualization application 526 may store some data, files, etc. on the mobile device 502 in one of the secure storage locations. An enterprise, for example, may elect to allow certain information to be stored on the mobile device 502 while not permitting other information.

In connection with the virtualization application 526, as described herein, the mobile device 502 may have a virtualization application 526 that is designed to present GUIs and then record user interactions with the GUI. The virtualization application 526 may communicate the user interactions to the server side to be used by the server side application as user interactions with the application. In response, the application on the server side may transmit back to the mobile device 502 a new GUI. For example, the new GUI may be a static page, a dynamic page, an animation, or the like, thereby providing access to remotely located resources.

The secure applications 514 may access data stored in a secure data container 528 in the managed partition 510 of the mobile device 502. The data secured in the secure data container may be accessed by the secure native applications 514, secure remote applications 522 executed by a secure application launcher 518, virtualization applications 526 executed by a secure application launcher 518, and the like. The data stored in the secure data container 528 may include files, databases, and the like. The data stored in the secure data container 528 may include data restricted to a specific secure application 530, shared among secure applications 532, and the like. Data restricted to a secure application may include secure general data 534 and highly secure data 538. Secure general data may use a strong form of encryption such as Advanced Encryption Standard (AES) 128-bit encryption or the like, while highly secure data 538 may use a very strong form of encryption such as AES 256-bit encryption. Data stored in the secure data container 528 may be deleted from the mobile device 502 upon receipt of a command from the device manager 524. The secure applications (e.g., 514, 522, and 526) may have a dual-mode option 540. The dual mode option 540 may present the user with an option to operate the secured application in an unsecured or unmanaged mode. In an unsecured or unmanaged mode, the secure applications may access data stored in an unsecured data container 542 on the unmanaged partition 512 of the mobile device 502. The data stored in an unsecured data container may be personal data 544. The data stored in an unsecured data container 542 may also be accessed by unsecured applications 546 that are running on the unmanaged partition 512 of the mobile device 502. The data stored in an unsecured data container 542 may remain on the mobile device 502 when the data stored in the secure data container 528 is deleted from the mobile device 502. An enterprise may want to delete from the mobile device 502 selected or all data, files, and/or applications owned, licensed or controlled by the enterprise (enterprise data) while leaving or otherwise preserving personal data, files, and/or applications owned, licensed or controlled by the user (personal data). This operation may be referred to as a selective wipe. With the enterprise and personal data arranged in accordance to the aspects described herein, an enterprise may perform a selective wipe.

The mobile device 502 may connect to enterprise resources 504 and enterprise services 508 at an enterprise, to the public Internet 548, and the like. The mobile device 502 may connect to enterprise resources 504 and enterprise services 508 through virtual private network connections. The virtual private network connections, also referred to as microVPN or application-specific VPN, may be specific to particular applications 550, particular devices, particular secured areas on the mobile device 552, and the like. For example, each of the wrapped applications in the secured area of the mobile device 502 may access enterprise resources through an application specific VPN such that access to the VPN would be granted based on attributes associated with the application, possibly in conjunction with user or device attribute information. The virtual private network connections may carry Microsoft Exchange traffic, Microsoft Active Directory traffic, HyperText Transfer Protocol (HTTP) traffic, HyperText Transfer Protocol Secure (HTTPS) traffic, application management traffic, and the like. The virtual private network connections may support and enable single-sign-on authentication processes 554. The single-sign-on processes may allow a user to provide a single set of authentication credentials, which are then verified by an authentication service 558. The authentication service 558 may then grant to the user access to multiple enterprise resources 504, without requiring the user to provide authentication credentials to each individual enterprise resource 504.

The virtual private network connections may be established and managed by an access gateway 560. The access gateway 560 may include performance enhancement features that manage, accelerate, and improve the delivery of enterprise resources 504 to the mobile device 502. The access gateway 560 may also re-route traffic from the mobile device 502 to the public Internet 548, enabling the mobile device 502 to access publicly available and unsecured applications that run on the public Internet 548. The mobile device 502 may connect to the access gateway via a transport network 562. The transport network 562 may be a wired network, wireless network, cloud network, local area network, metropolitan area network, wide area network, public network, private network, and the like.

The enterprise resources 504 may include email servers, file sharing servers, SaaS applications, Web application servers, Windows application servers, and the like. Email servers may include Exchange servers, Lotus Notes servers, and the like. File sharing servers may include ShareFile servers, and the like. SaaS applications may include Salesforce, and the like. Windows application servers may include any application server that is built to provide applications that are intended to run on a local Windows operating system, and the like. The enterprise resources 504 may be premise-based resources, cloud-based resources, and the like. The enterprise resources 504 may be accessed by the mobile device 502 directly or through the access gateway 560. The enterprise resources 504 may be accessed by the mobile device 502 via the transport network 562.

The enterprise services 508 may include authentication services 558, threat detection services 564, device manager services 524, file sharing services 568, policy manager services 570, social integration services 572, application controller services 574, and the like. Authentication services 558 may include user authentication services, device authentication services, application authentication services, data authentication services, and the like. Authentication services 558 may use certificates. The certificates may be stored on the mobile device 502, by the enterprise resources 504, and the like. The certificates stored on the mobile device 502 may be stored in an encrypted location on the mobile device 502, the certificate may be temporarily stored on the mobile device 502 for use at the time of authentication, and the like. Threat detection services 564 may include intrusion detection services, unauthorized access attempt detection services, and the like. Unauthorized access attempt detection services may include unauthorized attempts to access devices, applications, data, and the like. Device management services 524 may include configuration, provisioning, security, support, monitoring, reporting, and decommissioning services. File sharing services 568 may include file management services, file storage services, file collaboration services, and the like. Policy manager services 570 may include device policy manager services, application policy manager services, data policy manager services, and the like. Social integration services 572 may include contact integration services, collaboration services, integration with social networks such as Facebook, Twitter, and LinkedIn, and the like. Application controller services 574 may include management services, provisioning services, deployment services, assignment services, revocation services, wrapping services, and the like.

The enterprise mobility technical architecture 500 may include an application store 578. The application store 578 may include unwrapped applications 580, pre-wrapped applications 582, and the like. Applications may be populated in the application store 578 from the application controller 574. The application store 578 may be accessed by the mobile device 502 through the access gateway 560, through the public Internet 548, or the like. The application store 578 may be provided with an intuitive and easy to use user interface.

A software development kit 584 may provide a user the capability to secure applications selected by the user by wrapping the application as described previously in this description. An application that has been wrapped using the software development kit 584 may then be made available to the mobile device 502 by populating it in the application store 578 using the application controller 574.

The enterprise mobility technical architecture 500 may include a management and analytics capability 588. The management and analytics capability 588 may provide information related to how resources are used, how often resources are used, and the like. Resources may include devices, applications, data, and the like. How resources are used may include which devices download which applications, which applications access which data, and the like. How often resources are used may include how often an application has been downloaded, how many times a specific set of data has been accessed by an application, and the like.

FIG. 6 is another illustrative enterprise mobility management system 600. Some of the components of the mobility management system 500 described above with reference to FIG. 5 have been omitted for the sake of simplicity. The architecture of the system 600 depicted in FIG. 6 is similar in many respects to the architecture of the system 500 described above with reference to FIG. 5 and may include additional features not mentioned above.

In this case, the left hand side represents an enrolled mobile device 602 with a client agent 604, which interacts with gateway server 606 (which includes Access Gateway and application controller functionality) to access various enterprise resources 608 and services 609 such as Exchange, Sharepoint, public-key infrastructure (PKI) Resources, Kerberos Resources, Certificate Issuance service, as shown on the right hand side above. Although not specifically shown, the mobile device 602 may also interact with an enterprise application store (StoreFront) for the selection and downloading of applications.

The client agent 604 acts as the UI (user interface) intermediary for Windows apps/desktops hosted in an Enterprise data center, which are accessed using the High-Definition User Experience (HDX)/ICA display remoting protocol. The client agent 604 also supports the installation and management of native applications on the mobile device 602, such as native iOS or Android applications. For example, the managed applications 610 (mail, browser, wrapped application) shown in the figure above are all native applications that execute locally on the mobile device 602. Client agent 604 and application management framework of this architecture act to provide policy driven management capabilities and features such as connectivity and SSO (single sign on) to enterprise resources/services 608. The client agent 604 handles primary user authentication to the enterprise, normally to Access Gateway (AG) 606 with SSO to other gateway server components. The client agent 604 obtains policies from gateway server 606 to control the behavior of the managed applications 610 on the mobile device 602.

The Secure InterProcess Communication (IPC) links 612 between the native applications 610 and client agent 604 represent a management channel, which may allow a client agent to supply policies to be enforced by the application management framework 614 “wrapping” each application. The IPC channel 612 may also allow client agent 604 to supply credential and authentication information that enables connectivity and SSO to enterprise resources 608. Finally, the IPC channel 612 may allow the application management framework 614 to invoke user interface functions implemented by client agent 604, such as online and offline authentication.

Communications between the client agent 604 and gateway server 606 are essentially an extension of the management channel from the application management framework 614 wrapping each native managed application 610. The application management framework 614 may request policy information from client agent 604, which in turn may request it from gateway server 606. The application management framework 614 may request authentication, and client agent 604 may log into the gateway services part of gateway server 606 (also known as NETSCALER ACCESS GATEWAY). Client agent 604 may also call supporting services on gateway server 606, which may produce input material to derive encryption keys for the local data vaults 616, or may provide client certificates which may enable direct authentication to PKI protected resources, as more fully explained below.

In more detail, the application management framework 614 “wraps” each managed application 610. This may be incorporated via an explicit build step, or via a post-build processing step. The application management framework 614 may “pair” with client agent 604 on first launch of an application 610 to initialize the Secure IPC channel 612 and obtain the policy for that application. The application management framework 614 may enforce relevant portions of the policy that apply locally, such as the client agent login dependencies and some of the containment policies that restrict how local OS services may be used, or how they may interact with the managed application 610.

The application management framework 614 may use services provided by client agent 604 over the Secure IPC channel 612 to facilitate authentication and internal network access. Key management for the private and shared data vaults 616 (containers) may be also managed by appropriate interactions between the managed applications 610 and client agent 604. Vaults 616 may be available only after online authentication, or may be made available after offline authentication if allowed by policy. First use of vaults 616 may require online authentication, and offline access may be limited to at most the policy refresh period before online authentication is again required.

Network access to internal resources may occur directly from individual managed applications 610 through Access Gateway 606. The application management framework 614 may be responsible for orchestrating the network access on behalf of each managed application 610. Client agent 604 may facilitate these network connections by providing suitable time limited secondary credentials obtained following online authentication. Multiple modes of network connection may be used, such as reverse web proxy connections and end-to-end VPN-style tunnels 618.

The Mail and Browser managed applications 610 have special status and may make use of facilities that might not be generally available to arbitrary wrapped applications. For example, the Mail application 610 may use a special background network access mechanism that allows it to access an Exchange server 608 over an extended period of time without requiring a full AG logon. The Browser application 610 may use multiple private data vaults 616 to segregate different kinds of data.

This architecture may support the incorporation of various other security features. For example, gateway server 606 (including its gateway services) in some cases may not need to validate active directory (AD) passwords. It can be left to the discretion of an enterprise whether an AD password may be used as an authentication factor for some users in some situations. Different authentication methods may be used if a user is online or offline (i.e., connected or not connected to a network).

Step up authentication is a feature wherein gateway server 606 may identify managed native applications 610 that are allowed to have access to highly classified data requiring strong authentication, and ensure that access to these applications is only permitted after performing appropriate authentication, even if this means a re-authentication is required by the user after a prior weaker level of login.

Another security feature of this solution is the encryption of the data vaults 616 (containers) on the mobile device 602. The vaults 616 may be encrypted so that all on-device data including files, databases, and configurations are protected. For online vaults, the keys may be stored on the server (gateway server 606), and for offline vaults, a local copy of the keys may be protected by a user password or biometric validation. If or when data is stored locally on the mobile device 602 in the secure container 616, it may be preferred that a minimum of AES 256 encryption algorithm be utilized.

Other secure container features may also be implemented. For example, a logging feature may be included, wherein security events happening inside a managed application 610 may be logged and reported to the backend. Data wiping may be supported, such as if or when the managed application 610 detects tampering, associated encryption keys may be written over with random data, leaving no hint on the file system that user data was destroyed. Screenshot protection may be another feature, where an application may prevent any data from being stored in screenshots. For example, the key window's hidden property may be set to YES. This may cause whatever content is currently displayed on the screen to be hidden, resulting in a blank screenshot where any content would normally reside.

Local data transfer may be prevented, such as by preventing any data from being locally transferred outside the application container, e.g., by copying it or sending it to an external application. A keyboard cache feature may operate to disable the autocorrect functionality for sensitive text fields. SSL certificate validation may be operable so the application specifically validates the server SSL certificate instead of it being stored in the keychain. An encryption key generation feature may be used such that the key used to encrypt data on the mobile device 602 is generated using a passphrase or biometric data supplied by the user (if offline access is required). It may be XORed with another key randomly generated and stored on the server side if offline access is not required. Key Derivation functions may operate such that keys generated from the user password use KDFs (key derivation functions, notably Password-Based Key Derivation Function 2 (PBKDF2)) rather than creating a cryptographic hash of it. The latter makes a key susceptible to brute force or dictionary attacks.

Further, one or more initialization vectors may be used in encryption methods. An initialization vector will cause multiple copies of the same encrypted data to yield different cipher text output, preventing both replay and cryptanalytic attacks. This will also prevent an attacker from decrypting any data even with a stolen encryption key if the specific initialization vector used to encrypt the data is not known. Further, authentication then decryption may be used, wherein application data is decrypted only after the user has authenticated within the application. Another feature may relate to sensitive data in memory, which may be kept in memory (and not in disk) only when it's needed. For example, login credentials may be wiped from memory after login, and encryption keys and other data inside objective-C instance variables are not stored, as they may be easily referenced. Instead, memory may be manually allocated for these.

An inactivity timeout may be implemented, wherein after a policy-defined period of inactivity, a user session is terminated.

Data leakage from the application management framework 614 may be prevented in other ways. For example, if or when a managed application 610 is put in the background, the memory may be cleared after a predetermined (configurable) time period. When backgrounded, a snapshot may be taken of the last displayed screen of the application to fasten the foregrounding process. The screenshot may contain confidential data and hence should be cleared.

Another security feature may relate to the use of an OTP (one time password) 620 without the use of an AD (active directory) 622 password for access to one or more applications. In some cases, some users do not know (or are not permitted to know) their AD password, so these users may authenticate using an OTP 620 such as by using a hardware OTP system like SecurID (OTPs may be provided by different vendors also, such as Entrust or Gemalto). In some cases, after a user authenticates with a user ID, a text may be sent to the user with an OTP 620. In some cases, this may be implemented only for online use, with a prompt being a single field.

An offline password may be implemented for offline authentication for those managed applications 610 for which offline use is permitted via enterprise policy. For example, an enterprise may want StoreFront to be accessed in this manner In this case, the client agent 604 may require the user to set a custom offline password and the AD password is not used. Gateway server 606 may provide policies to control and enforce password standards with respect to the minimum length, character class composition, and age of passwords, such as described by the standard Windows Server password complexity requirements, although these requirements may be modified.

Another feature may relate to the enablement of a client side certificate for certain applications 610 as secondary credentials (for the purpose of accessing PKI protected web resources via the application management framework micro VPN feature). For example, a managed application 610 may utilize such a certificate. In this case, certificate-based authentication using ActiveSync protocol may be supported, wherein a certificate from the client agent 604 may be retrieved by gateway server 606 and used in a keychain. Each managed application 610 may have one associated client certificate, identified by a label that is defined in gateway server 606.

Gateway server 606 may interact with an enterprise special purpose web service to support the issuance of client certificates to allow relevant managed applications to authenticate to internal PKI protected resources.

The client agent 604 and the application management framework 614 may be enhanced to support obtaining and using client certificates for authentication to internal PKI protected network resources. More than one certificate may be supported, such as to match various levels of security and/or separation requirements. The certificates may be used by the Mail and Browser managed applications 610, and ultimately by arbitrary wrapped applications 610 (provided those applications use web service style communication patterns where it is reasonable for the application management framework to mediate HTTPS requests).

Application management client certificate support on iOS may rely on importing a public-key cryptography standards (PKCS) 12 BLOB (Binary Large Object) into the iOS keychain in each managed application 610 for each period of use. Application management framework client certificate support may use a HTTPS implementation with private in-memory key storage. The client certificate may not be present in the iOS keychain and may not be persisted except potentially in “online-only” data value that is strongly protected.

Mutual SSL may also be implemented to provide additional security by requiring that a mobile device 602 is authenticated to the enterprise, and vice versa. Virtual smart cards for authentication to gateway server 606 may also be implemented.

Both limited and full Kerberos support may be additional features. The full support feature relates to an ability to do full Kerberos login to Active Directory (AD) 622, using an AD password or trusted client certificate, and obtain Kerberos service tickets to respond to HTTP Negotiate authentication challenges. The limited support feature relates to constrained delegation in Citrix Access Gateway Enterprise Edition (AGEE), where AGEE supports invoking Kerberos protocol transition so it can obtain and use Kerberos service tickets (subject to constrained delegation) in response to HTTP Negotiate authentication challenges. This mechanism works in reverse web proxy (aka corporate virtual private network (CVPN)) mode, and when HTTP (but not HTTPS) connections are proxied in VPN and MicroVPN mode.

Another feature may relate to application container locking and wiping, which may automatically occur upon jail-break or rooting detections, and occur as a pushed command from administration console, and may include a remote wipe functionality even when a managed application 610 is not running.

A multi-site architecture or configuration of enterprise application store and an application controller may be supported that allows users to be serviced from one of several different locations in case of failure.

In some cases, managed applications 610 may be allowed to access a certificate and private key via an API (for example, OpenSSL). Trusted managed applications 610 of an enterprise may be allowed to perform specific Public Key operations with an application's client certificate and private key. Various use cases may be identified and treated accordingly, such as if or when an application behaves like a browser and no certificate access is required, if or when an application reads a certificate for “who am I,” if or when an application uses the certificate to build a secure session token, and if or when an application uses private keys for digital signing of important data (e.g. transaction log) or for temporary data encryption.

Dynamic Crypto Key Management for Mobility in a Cloud Environment

As discussed above, aspects of the disclosure relate to providing dynamic encryption key management in cloud computing environments. In addition, one or more aspects of the disclosure may incorporate, be embodied in, and/or be implemented using one or more of the computer system architecture, remote-access system architecture, virtualized (hypervisor) system architecture, cloud-based system architecture, and/or enterprise mobility management systems discussed above in connection with FIGS. 1-6.

FIG. 7 depicts an illustrative computing environment for dynamic crypto key management for mobility in a cloud environment in accordance with one or more illustrative aspects described herein. Referring to FIG. 7, computing environment 700 may include a key update server 710, an administrator console device 720, a cloud-based key vault server 730, enrollment servers 740, a tenant database server 750, policy-managed devices 760, a device management server 770 and a network 780. Key update server 710, administrator console device 720, cloud-based key vault server 730, enrollment servers 740, tenant database server 750, policy-managed devices 760 and device management server 770 may include one or more physical components, such as one or more processors, memories, communication interfaces, and/or the like.

Key update server 710 may include processor 711, memory 712, and communication interface 713. Processor 711 may execute instructions stored in memory 712 to cause key update server 710 to perform one or more functions, such as providing a key update service to generate new encryption keys. Communication interface 713 may include one or more network interfaces via which key update server 710 can communicate with one or more other systems and/or devices in computing environment 700, such as administrator console device 720, cloud-based key vault server 730, enrollment servers 740, policy-managed devices 760 and device management server 770. An administrator console device 720 may be associated with an enterprise organization and may send and receive information to the other computing devices of computing environment 700.

Administrator console device 720 may enable an administrator to communicate with key update server 710. For example, an administrator may send, via the administrator console device 720, a request to key update server 710 to initiate a crypto upgrade procedure. In some examples, as illustrated in FIG. 7, key update server 710 and administrator console device 720 are separate computing devices. In alternative arrangements, key update server 710 and administrator console device 720 may reside on the same computing device. Additionally, in some examples, an administrator may issue commands, via the administrator console device 720, to communication with enrollment servers 740. For instance, when there is suspicious activity for a potential attacker detected on an enrollment server, the administrator user may take the affected enrollment server offline, and conduct the necessary analysis on the server. If the keys are compromised in any fashion, the administrator user may initiate key revocation and crypto upgrade procedures as detailed below. Alternatively, the administrator user may spin up a new enrollment server online to replace the compromised enrollment server.

Cloud-based key vault server 730 may include a hardware security module (HSM) that safeguards and manages digital keys for authentication and provides crypto processing. Cloud-based key vault server 730 may be part of a mission-critical infrastructure that stores digital keys of high-value, which means there would be a significant, negative impact to the owner of the key if it were compromised. In some embodiments, cloud-based key vault server 730, HSMs and/or the cryptographic modules may be certified to internationally recognized standards such as Common Criteria or Federal Information Processing Standard (FIPS) to provide users with independent assurance that the design and implementation of the product and cryptographic algorithms are sound. The functionalities of cloud-based key vault server 730 and the corresponding HSM may be implemented either in software or hardware.

Enrollment servers 740 may manage the enrollment and operations of the policy-managed devices 760. Policy-managed devices 760 may be a mobile device 502 and/or a client device (e.g., client device 107). A product or product family may be implemented to run programs in a secured manner to provide a policy-managed application space on policy-managed devices 760. As a result, for example, an end user on the policy-managed devices 760 may have secure access to emails, open a document in the attachment of the email and access an enterprise's intranet. Enrollment servers 740 may form part or all of the backend control component that downloads the applications, policies, updates, and otherwise accept connections from policy-managed devices 760. To support the management of policy-managed devices 760, an administrator user may define the policies via administrator console device 720 and store the policies in enrollment servers 740. Subsequently, the administrator user may access administrator console device 720 either remotely or physically, to affect the operations of enrollment servers 740, such as to manage the configuration of enrollment servers 740.

In some instances, enrollment servers 740 may implement a Mobile Application Management (MAM) scheme, where applications may be managed individually. For example, certain applications such as a mail application may have certain retention policies organized for the application that are communicated from enrollment servers 740 to policy-managed devices 760. In some instance, enrollment servers 740 may implement a Mobile Device Management (MDM) scheme, where the policies defined for a certain policy-managed device are bundled together and delivered to the target policy-managed device from enrollment servers 740. Enrollment servers 740 may include one or more servers, depending on the load balancing service and the demand of the enterprise system. Each enrollment server may be equivalent to or different from each other. In some embodiments, enrollment servers 740 may communicate with device management server 770 to implement a MDM scheme. Device management server 770 may in turn communicate with policy-managed devices 760 for the crypto key generation and upgrade process for a device assigned to each of the policy-managed devices 760.

Each enrollment server may be assigned a server recovery key, which may be stored in tenant database server 750. Tenant database server 750 may store one or more databases, such as databases 129 or 131. Tenant database server 750 may interact with one or more tenant databases hosted on enrollment servers 740 or may host one or more tenant databases that are remotely accessible to enrollment servers 740.

Network 780 may include one or more wide area networks and/or local area networks and may interconnect one or more systems and/or devices included in computing environment 700. For example, network 780 may interconnect key update server 710, administrator console device 720, cloud-based key vault server 730, enrollment servers 740, tenant database server 750, policy-managed devices 760, and device management server 770.

FIGS. 8A-8E depict an example event sequence for dynamic crypto key management for mobility in a cloud environment in accordance with one or more illustrative aspects described herein. The communications between components of FIGS. 8A-8E may be encrypted via Transport Layer Security (TLS) cryptographic protocols or Internet Protocol Security (IPsec) tunnels that provide communications security over a computer network.

Referring to FIG. 8A, in step 801, administrator console device 720 may send commands directing a compromised enrollment server to go offline. For example, when an enrollment server gets compromised, the administrator user of administrator console device 720 may send commands, via administrator console device 720, to take the compromised enrollment server offline. As such, the compromised enrollment server may stay isolated and no longer service enrollment of policy-managed devices. In step 802, administrator console device 720 may send commands directing a new enrollment server to go online. For example, the administrator user may send commands, via administrator console device 720, to spin up as many new enrollment servers 740 as needed. Given that the embodiments of the dynamic crypto key management for mobility in a cloud environment may take a layered approach for the crypto key management and there may be several levels of abstractions, a master key stored in the cloud-based key vault server 730 for a given tenant may unlock the components on enrollment servers 740 locally. As a result, a relatively small piece of information may be needed to communicate with cloud-based key vault server 730; when an enrollment server is compromised, it may be relatively easier to remove the compromised enrollment server and spin up a new enrollment server for replacement.

In step 803, key update server 710 may receive a request to generate new keys. In particular, key update server 710 may receive, via a key upgrade service provided by the computing platform, from an administrator console device, a request to generate one or more new keys. For example, key update server 710 may receive a request from administrator console device 720 to generate a new tenant master key and a new server recovery key. In some examples, administrator console device 720 may initiate a crypto upgrade procedure due to a breach on an enrollment server or other computing devices in the crypto key management infrastructure. In alternative examples, administrator console device 720 may initiate a crypto upgrade procedure with the passage of time that a crypto key needs to be re-generated. An administrator user may initiate and communicate with the key upgrade server 710 via administrator console device 720. Indeed, this layered approach of key management scheme, might not be limited to a particular usage of the keys. For example, one usage of the keys is to protect customer-stored credentials for the enterprise. Another example is to identify a particular server to the client so the client may know it is talking to the right server, to communicate with a secure server via a secure browser, or to communicate to a secure internal network of the enterprise. Upon the administrator user may initiate a crypto key upgrade service for a tenant, role of this service may be to manage the crypto transition for all the keys that are being replaced.

In step 804, key upgrade server 710 may generate a new tenant master key and a new server recovery key. In particular, in response to receiving the request to generate the one or more new keys, key update server 710 may generate a new tenant master key and a new server recovery key. For instance, a tenant master key may be assigned to a tenant—e.g., a customer or a company, who may have its unique master key to offer separation of the customers and companies. In some examples, any two tenants may not share their tenant master key, and there may be one tenant master key for each individual enrollment customer. In the process of data flow, each tenant may become aware of its individual tenant master key; but the tenants do not store their master tenant keys themselves. Key upgrade server 710 may generate the tenant master key using Common Criteria, FIPS, or FedRAMP compliant methods.

Likewise, key upgrade server 710 may generate a server recovery key for a tenant using the similar methods. In some examples, all enrollment servers 740 for a specific tenant may use a shared server recovery key. In some other examples, there may be a separate server recovery key per enrollment server in the tenant's deployment. Notably, the embodiments offer flexibility in both cases—using multiple server recovery keys for a single tenant may just add one more layer of abstraction.

In step 805, key update server 710 may send to a cloud-based key vault server, the new tenant master key and the new server recovery key. In particular, key update server 710 may send, via the communication interface, to a cloud-based key vault server, the new tenant master key and the new server recovery key. For example, key update server 710 may send the new tenant master key and new server recovery key to cloud-based key vault server 730.

As illustrated in FIG. 8B and in step 806, the cloud-based key vault server 730 may store the new tenant master key and may encrypt the new server recovery key with the new tenant master key to produce an encrypted server recovery key. In particular, cloud-based key vault server 730 may be configured to store the new tenant master key and may be further configured to encrypt the new server recovery key with the new tenant master key to produce an encrypted server recovery key Because the sever recovery key may be encrypted by the tenant master key within the boundary of cloud-based key vault server 730, the content server recovery key cannot be read directly by enrollment servers 740.

Rather, in step 807, key update server 710 may receive the encrypted server recovery key from cloud-based key vault server 730; and in step 808, key update server 710 may send the encrypted server recovery key to tenant database server 750. In particular, key update server 710 may receive, via the communication interface, from the cloud-based key vault server, the encrypted server recovery key in step 807; and key update server 710 may send, via the communication interface, to a tenant database server associated with one or more enrollment servers, the encrypted server recovery key in step 808. In some examples, tenant database server 750 may be associated with enrollment servers 740 such that enrollment servers 740 may readily retrieve the encrypted server recovery key from tenant database server 750. In some examples, the crypto key hierarchy may contain another layer of abstraction via the implementation of tenant database server encryption keys, which may be controlled by the administrator user for the tenant.

In step 809, key update server 710 may provision enrollment servers 740 with the encrypted server recovery key by sending the encrypted server recovery key to enrollment servers 740. In particular, key update server 710 may provision, the one or more enrollment servers with the encrypted server recovery key by sending the encrypted server recovery key to the one or more enrollment servers via the communication interface. Upon the completion of the provision process by key update server 710, when an enrollment server is rebooted, it may read the encrypted server recovery key from tenant database server 750; and the enrollment server may subsequently use the encrypted server recovery key to access to cloud-based key vault server 730. Once cloud-based key vault server 730 verifies that the enrollment server is authenticated as a valid server to be communicated with, cloud-based key vault server 730 may decrypt the encrypted server recovery key and return the clear text version of the server recovery key to the enrollment server. Accordingly, the enrollment server may know the clear version of the server recovery key, but the enrollment server might not store it on the disk.

In step 810, enrollment servers 740 manage enrollment of one or more policy-managed devices in a policy enforcement scheme and enrollment servers 740 are configured to authenticate with the key update server 710 based on the encrypted server recovery key. In particular, as a result of the key update server 710 provisioning of the one or more enrollment servers, the one or more enrollment servers may be configured to manage enrollment of one or more policy-managed devices in a policy enforcement scheme and to authenticate with the key update service based on the encrypted server recovery key. For example, key update server 710 may act as an intermediary between cloud-based key vault server 730 and enrollment servers 740. Every time an enrollment server is booted up and if there is a need to generate new keys, the process may incur an access to cloud-based key vault server 730 and the cost that comes along with each access. The embodiments may communicate with cloud-based key vault server 730 much less frequently and this cost may be lowered. The embodiments may implement a layered approach for the storage and management of the encryption keys. Instead of storing all the relevant keys in cloud-based key vault server 730, some key information may be stored close to the enrollment servers, and may be unlocked by the tenant master key retrieved from cloud-based key vault server 730. As such, this layered approach may incur less cost by using the tenant master key in cloud-based key vault server 730 to unlock other keys that may be accessed more frequently.

For instance, when an enrollment server is started up or rebooted, the enrollment server may read the encrypted server recovery key from tenant database server 750 without incurring extra cost for the access to cloud-based key vault server 730. The enrollment server may submit the encrypted server recovery key to cloud-based key vault server 730 for authentication, which may decrypt the encrypted server recovery key and return the plaintext version of the server recovery key to the enrollment server via TLS or IPsec tunnels. The decrypted server recovery key might only live in the enrollment server's memory, but might not be stored on disk.

In some examples, if a tenant's enrollment server is compromised by an attacker, the compromised server may be taken offline and isolated for forensic analysis. If it is believed the server recovery key or other crypto keys were compromised, then the revocation steps may be taken to regenerate the key. In normal operations, when a tenant needs an additional enrollment server, it may spin up the new enrollment server image and obtain the server recovery key as defined above.

Turning to FIG. 8C and in step 811, key update server 710 may detect the new enrollment server is online.

In step 812, key update server 710 may send the encrypted server recovery key to the new enrollment server, as described in step 809.

In step 813, key update server 710 may provision the new enrollment server, thereby enabling the policy-managed devices 760 to enroll with the new enrollment server. Upon the spin-up of the new enrollment, policy-managed devices 760 may need to re-enroll with the new enrollment server and to provide the user credentials to the enrollment server, which may be either virtual machines or physical machines. Policy-managed devices 760 may enroll without deleting the data of the pre-existing applications.

In step 814, key update server 710 may enable device management server 770 to send new variables V1/V2 to the policy-managed devices 760. In some examples, administrator console device 720 may indicate that specific policy-managed devices 760 need to update their mobile device keys. Mobile device keys may be the keys generated on policy-managed devices 760. An administrator user may log into administrator console device 720 to specifically identify policy-managed devices 760 using e.g. Active Directory, validate policy-managed devices 760 via naming scheme, and ripple through the effect from the administrator console device 720 to device management server 770. For instance, the administrator user may instruct device management server 770 to revoke the previous portion of the key materials for each user/policy-managed device combination by generating new variables V1/V2 for policy-managed devices 760. For example, the administrator user may request at administrator console device 720 to upgrade the keys for certain devices that belong to a set of users. A user may have more than one device, so the enrollment server may obtain the list of active devices for each user. At this point the administrator user may select which devices require keys to be upgraded. The administrator user's selections may be propagated as a key revocation message to the device management server 770. When the users' policy manages devices go online next time, they may be prompted to upgrade the corresponding device keys.

In step 815, policy-managed devices 760 may receive the new variables V1/V2 from the device management server 770; and in step 816, the policy-managed devices may generate the device key based on the new variables V1/V2 from device management server 770. As noted above, to allow any crypto key upgrades to be as transparent as possible to the customers, the embodiments implement the hierarchy of crypto keys including a device key, which may be derived from new variables V1/V2 from device management server 770, along with device specific information. The crypto keys may also include file keys, which may be encrypted by the device key. File keys may be used to encrypt and decrypt files on policy-managed devices 760 and may be created using the Crypto Kit API to maintain device compliance. The crypto keys may further include tenant database server encryption keys controlled by the tenant's administrator user; and tenant master key and server recovery key as defined above.

Each of the keys above may become expired after a predetermined amount of time, or may be revoked, or upgraded to a different strength, etc. at some point in the lifespan of a customer's deployment. In addition, if a security breach occurs, some or all of the keys may need to be replaced. The key upgrade process may be carried out in a fashion that does not require the customer to lose all their current data.

Turning to FIG. 8D, in step 817, policy-managed devices 760 may read offline variables V1/V2 from local storage of policy-managed devices 760. For example, such variables may be created previously by device management server 770 and stored in the local storage of policy-managed devices 760.

In step 818, policy-managed devices 760 may generate an offline device key based on the offline variables V1/V2 from the local storage of the policy-managed devices

In step 819, policy-managed devices 760 may read encrypted file keys from the local storage. In some examples, the encrypted file keys may be generated for each of the documents on policy-managed devices 760. For instance, policy-managed devices 760 may store many files to be protected for the tenant company. There may be cryptographic reasons for each file to have its file key and, all those file keys may be protected by the corresponding device key of the policy-managed device.

In step 820, policy-managed devices 760 may decrypt the encrypted file keys with the offline device key. In some examples, a device key may uniquely identify a policy-managed device.

In step 821, policy-managed devices 760 may encrypt the file keys with the device key created from the new variables V1/V2 to generate the encrypted file keys.

The flow continues in FIG. 8E and in step 822, policy-managed devices 760 may store the encrypted file keys in the local storage; and in step 823, policy-managed devices 760 may store the new variables V1/V2 in the local storage.

In step 824, policy-managed devices 760 may receive a passphrase (such as a WorxPIN and other unique device data) from a user of the policy-managed devices and in step 825, generate an encrypted device key based on the passphrase

Finally, in step 826, policy-managed devices 760 may store the encrypted device key in the local storage of policy-managed devices 760. In some examples, future Transparent File Encryption operations may be able to continue without downtime, while the user's files and data may not be impacted by this key upgrade and may still be available for access to the policy-managed devices 760. Given that a device key may be created and stored on the device, through variables received from device management server, and encrypted with a user provided passphrase, the users may travel with the policy-managed device and have access to the files, ever when they cannot connect to the device management server.

In some examples, a policy-managed device receives a message indicating that variables V1/V2 are being revoked, indicating the employee may change positions or the device may be lost. When the device is turned on, it may receive a revocation message. When the mobile device attempts to reconnect to the network, the device may receive new variables V1/V2 from device management server to replace those old variables, invoking the process for the old device key to phase out and the new device key to phase in.

In some examples, the administrator user may mark specific policy-managed devices as needing to upgrade their device keys. For instance, the administrator user may log into the administrator console device, entering into the Active Directory the name for each user that may have a device requiring the device key to be upgraded. This operation may cause the enrollment server to instruct the device management server to revoke the variables V1/V2 for each entered user/device combination. Alternatively, the administrator user may enter an Active Directory group name, which may cause all users in that group to have their devices' variables V1/V2 values revoked on the device management server.

FIG. 9 depicts an illustrative method for dynamic crypto key management for mobility in a cloud environment in accordance with one or more example embodiments. Referring to FIG. 9, at step 902, a computing platform (e.g. key update server 710) having at least one processor, a communication interface, and memory, may receive via a key upgrade service provided by the computing platform, from an administrator console device, a request to generate one or more new keys. At step 904, in response to receiving the request to generate the one or more new keys, the computing platform generates a new tenant master key and a new server recovery key. At step 906, the computing platform sends the new tenant master key and the new server recovery key, via the communication interface, to a cloud-based key vault server, where the cloud-based key vault server is configured to store the new tenant master key and is further configured to encrypt the new server recovery key with the new tenant master key to produce an encrypted server recovery key. At step 908, the computing platform receives the encrypted server recovery key via the communication interface, from the cloud-based key vault server. At step 910, the computing platform sends via the communication interface, to a tenant database server associated with one or more enrollment servers, the encrypted server recovery key. At step 912, the computing platform provisions the one or more enrollment servers with the encrypted server recovery key by sending the encrypted server recovery key to the one or more enrollment servers via the communication interface. As a result of the computing platform provisioning of the enrollment servers, the one or more enrollment servers are configured to manage enrollment of one or more policy-managed devices in a policy enforcement scheme and to authenticate with the key update service based on the encrypted server recovery key.

One or more aspects of the disclosure may be embodied in computer-usable data or computer-executable instructions, such as in one or more program modules, executed by one or more computers or other devices to perform the operations described herein. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types when executed by one or more processors in a computer or other data processing device. The computer-executable instructions may be stored as computer-readable instructions on a computer-readable medium such as a hard disk, optical disk, removable storage media, solid-state memory, RAM, and the like. The functionality of the program modules may be combined or distributed as desired in various embodiments. In addition, the functionality may be embodied in whole or in part in firmware or hardware equivalents, such as integrated circuits, application-specific integrated circuits (ASICs), field programmable gate arrays (FPGA), and the like. Particular data structures may be used to more effectively implement one or more aspects of the disclosure, and such data structures are contemplated to be within the scope of computer executable instructions and computer-usable data described herein.

Various aspects described herein may be embodied as a method, an apparatus, or as one or more computer-readable media storing computer-executable instructions. Accordingly, those aspects may take the form of an entirely hardware embodiment, an entirely software embodiment, an entirely firmware embodiment, or an embodiment combining software, hardware, and firmware aspects in any combination. In addition, various signals representing data or events as described herein may be transferred between a source and a destination in the form of light or electromagnetic waves traveling through signal-conducting media such as metal wires, optical fibers, or wireless transmission media (e.g., air or space). In general, the one or more computer-readable media may be and/or include one or more non-transitory computer-readable media.

As described herein, the various methods and acts may be operative across one or more computing servers and one or more networks. The functionality may be distributed in any manner, or may be located in a single computing device (e.g., a server, a client computer, and the like). For example, in alternative embodiments, one or more of the computing platforms discussed above may be implemented in one or more virtual machines that are provided by one or more physical computing devices. In such arrangements, the various functions of each computing platform may be performed by the one or more virtual machines, and any and/or all of the above-discussed communications between computing platforms may correspond to data being accessed, moved, modified, updated, and/or otherwise used by the one or more virtual machines.

Aspects of the disclosure have been described in terms of illustrative embodiments thereof. Numerous other embodiments, modifications, and variations within the scope and spirit of the appended claims will occur to persons of ordinary skill in the art from a review of this disclosure. For example, one or more of the steps depicted in the illustrative figures may be performed in other than the recited order, and one or more depicted steps may be optional in accordance with aspects of the disclosure.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are described as example implementations of the following claims. 

What is claimed is:
 1. A method comprising: at a computing platform comprising at least one processor, memory, and a communication interface: generating, by the at least one processor, a tenant master key and a server recovery key; sending, by the at least one processor, via the communication interface, and to a cloud-based key vault server, the tenant master key and the server recovery key, wherein the cloud-based key vault server is configured to store the tenant master key and is further configured to encrypt the server recovery key with the tenant master key to produce an encrypted server recovery key; storing the encrypted server recovery key in a tenant database server associated with one or more enrollment servers; and provisioning the one or more enrollment servers with the encrypted server recovery key.
 2. The method of claim 1, wherein the one or more enrollment servers are configured to manage enrollment of a plurality of policy-managed devices in a policy enforcement scheme and to authenticate with a key update service based on the encrypted server recovery key.
 3. The method of claim 1, wherein provisioning the one or more enrollment servers comprises: sending the encrypted server recovery key to the one or more enrollment servers via the communication interface.
 4. The method of claim 1, wherein the encrypted server recovery key enables a plurality of policy-managed devices associated with a tenant to authenticate with a key update service.
 5. The method of claim 1, further comprising: prior to generating the master tenant key, receiving, by the at least one processor and via a key upgrade service provided by the computing platform, a request to generate one or more new keys.
 6. The method of claim 1, further comprising: detecting, by the at least one processor, that a new enrollment server is online; and sending, by the at least one processor and via the communication interface, the encrypted server recovery key to the new enrollment server.
 7. The method of claim 1, further comprising: sending, by the at least one processor and via the communication interface, commands directing a device management server to send new variables to a plurality of policy-managed devices, wherein the plurality of policy-managed devices are configured to generate a device key for each of the plurality of policy-managed devices based on the new variables.
 8. The method of claim 7, wherein sending the commands causes the plurality of policy-managed devices to: receive a passphrase from user associated with a policy-managed device of the plurality of policy-managed devices; generate an encrypted device key based on the passphrase; and store the encrypted device key in local storage of the corresponding policy-managed device.
 9. The method of claim 7, wherein sending the commands causes the plurality of policy-managed devices to: generate file keys for one or more files residing on the plurality of policy-managed devices.
 10. The method of claim 1, wherein the tenant database server is separate from the cloud-based key vault server.
 11. The method of claim 1, further comprising: sending, by the at least one processor and via the communication interface, commands directing a device management server to send new variables to a plurality of policy-managed devices, wherein sending the commands causes the plurality of policy-managed devices to: read offline variables from local storage of a policy-managed device of the plurality of policy-managed devices; generate an offline device key based on the offline variables from the local storage; read offline encrypted file keys from the local storage, wherein the offline encrypted file keys correspond to files residing on the policy-managed device; decrypt the offline encrypted file keys with the offline device key to generate decrypted file keys; and encrypt the decrypted file keys with the device key generated based on the new variables to generate encrypted file keys.
 12. The method of claim 11, wherein the commands further cause the plurality of policy-managed devices to: store the encrypted file keys in the local storage of the plurality of policy-managed devices; and store the new variables in the local storage.
 13. A computing platform, comprising: at least one processor; a communication interface communicatively coupled to the at least one processor; and memory storing computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: generate, by the at least one processor, a tenant master key and a server recovery key; send, by the at least one processor, via the communication interface, to a cloud-based key vault server, the tenant master key and the server recovery key, wherein the cloud-based key vault server is configured to store the tenant master key and is further configured to encrypt the server recovery key with the tenant master key to produce an encrypted server recovery key; store the encrypted server recovery key in a tenant database server associated with one or more enrollment servers; and provision the one or more enrollment servers with the encrypted server recovery key.
 14. The computing platform of claim 13, wherein the memory stores additional computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: detect that a new enrollment server is online; and send, via the communication interface, the encrypted server recovery key to the new enrollment server.
 15. The computing platform of claim 14, wherein the memory stores additional computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: provision the new enrollment server enabling a plurality of policy-managed devices to enroll with the new enrollment server.
 16. The computing platform of claim 13, wherein the memory stores additional computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: cause a plurality of policy-managed devices to generate a device key for each of the plurality of policy-managed devices.
 17. The computing platform of claim 13, wherein the memory stores additional computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: cause a plurality of policy-managed devices to generate file keys for one or more files residing on the plurality of policy-managed devices.
 18. The computing platform of claim 13, wherein the memory stores additional computer-readable instructions that, when executed by the at least one processor, cause the computing platform to: send, via the communication interface, commands directing a device management server to send new variables to a plurality of policy-managed devices.
 19. The computing platform of claim 18, wherein sending the commands directing the device management server to send the new variables to the plurality of policy-managed devices causes the plurality of policy-managed devices to: generate a device key based on the new variables from the device management server.
 20. One or more non-transitory computer-readable media storing instructions that, when executed by a computing platform comprising at least one processor, memory, and a communication interface, cause the computing platform to: generate, by the at least one processor, a tenant master key and a server recovery key; send, by the at least one processor, via the communication interface, and to a cloud-based key vault server, the tenant master key and the server recovery key, wherein the cloud-based key vault server is configured to store the tenant master key and is further configured to encrypt the server recovery key with the tenant master key to produce an encrypted server recovery key; store the encrypted server recovery key in a tenant database server associated with one or more enrollment servers; and provision the one or more enrollment servers with the encrypted server recovery key. 